Small copper line on top of water heater pipe

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Calj

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i noticed there is a small copper pipe that is disconnected from the fitting on the main pipe on top of the water heater and I am unsure of its purpose. I had a family relative remodel our laundry room 2.5 years ago and he made a lot of mistakes with the plumbing. I am wondering if he forgot to reconnect the line or it was always this way. What is the purpose and do you recommend I reconnect it or leave it disconnected?
 

FishScreener

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Jeff Handy

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That old saddle valve could also have been for a furnace mounted humidifier.

Yes, they are pure junk and pretty much doomed to leak.
 
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